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916.1.1 At least one vent in the venting system shall have a three inch diameter extending from <br />the building drain through the roof. <br />Section. 14.103. Permit; licensing. <br />(a) A person applying for a plumbing permit shall be: <br />(1) A licensed master plumber under state law; or <br />(2) Exempt from the state licensing law. <br />(b) A state licensed master plumber shall register with the city once a year and show proof of <br />the license and insurance before any work is performed within the city or on pipes connected to <br />the city's water or wastewater service; or <br />(c) If a building owner is claiming an exemption under state law because he owns and presently <br />occupies the building as his or her homestead and is planning to do the work himself, then the <br />owner shall provide an affidavit to the building official stating that he owns and presently <br />occupies the building as his homestead. <br />DIVISION 2. WATER CONSERVATION <br />Sec. 14.120. Definitions. <br />Terms in this division have the following meanings unless otherwise specified: <br />Adjustable flow control means a mechanism that can be adjusted to restrict water flow through a <br />valve, thus reducing discharge pressure. <br />Check valve means a device that allows water to flow in one direction only and prevents flow <br />through the system unless a pre -set pressure has been achieved. <br />Commercial water customer means a city water customer that uses water for service- related uses <br />such as restaurants, hotels /motels, retail stores, car washes, laundromats /dry cleaners, physician's <br />offices and office buildings. <br />Conveyor carwash means a commercial car wash that uses a conveyor belt to move vehicles <br />through various washing stations. <br />Cooling system means a heating, ventilation and air conditioning system that uses water for <br />cooling purposes. <br />Cycles of concentration means a measure of the number of times the solids content of <br />recirculating water has been increased over that of the make -up water. Example: If the <br />